1 #ifndef _ASM_POWERPC_BOOK3S_64_PGALLOC_H
2 #define _ASM_POWERPC_BOOK3S_64_PGALLOC_H
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
10 #include <linux/slab.h>
11 #include <linux/cpumask.h>
12 #include <linux/kmemleak.h>
13 #include <linux/percpu.h>
15 struct vmemmap_backing {
16 struct vmemmap_backing *list;
18 unsigned long virt_addr;
20 extern struct vmemmap_backing *vmemmap_list;
22 extern pmd_t *pmd_fragment_alloc(struct mm_struct *, unsigned long);
23 extern void pmd_fragment_free(unsigned long *);
24 extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift);
26 extern void __tlb_remove_table(void *_table);
28 void pte_frag_destroy(void *pte_frag);
30 static inline pgd_t *radix__pgd_alloc(struct mm_struct *mm)
32 #ifdef CONFIG_PPC_64K_PAGES
33 return (pgd_t *)__get_free_page(pgtable_gfp_flags(mm, PGALLOC_GFP));
36 page = alloc_pages(pgtable_gfp_flags(mm, PGALLOC_GFP | __GFP_RETRY_MAYFAIL),
40 return (pgd_t *) page_address(page);
44 static inline void radix__pgd_free(struct mm_struct *mm, pgd_t *pgd)
46 #ifdef CONFIG_PPC_64K_PAGES
47 free_page((unsigned long)pgd);
49 free_pages((unsigned long)pgd, 4);
53 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
58 return radix__pgd_alloc(mm);
60 pgd = kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
61 pgtable_gfp_flags(mm, GFP_KERNEL));
66 * Don't scan the PGD for pointers, it contains references to PUDs but
67 * those references are not full pointers and so can't be recognised by
70 kmemleak_no_scan(pgd);
73 * With hugetlb, we don't clear the second half of the page table.
74 * If we share the same slab cache with the pmd or pud level table,
75 * we need to make sure we zero out the full table on alloc.
76 * With 4K we don't store slot in the second half. Hence we don't
77 * need to do this for 4k.
79 #if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_PPC_64K_PAGES) && \
80 (H_PGD_INDEX_SIZE == H_PUD_CACHE_INDEX)
81 memset(pgd, 0, PGD_TABLE_SIZE);
86 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
89 return radix__pgd_free(mm, pgd);
90 kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
93 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
95 *pgd = __pgd(__pgtable_ptr_val(pud) | PGD_VAL_BITS);
98 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
102 pud = kmem_cache_alloc(PGT_CACHE(PUD_CACHE_INDEX),
103 pgtable_gfp_flags(mm, GFP_KERNEL));
105 * Tell kmemleak to ignore the PUD, that means don't scan it for
106 * pointers and don't consider it a leak. PUDs are typically only
107 * referred to by their PGD, but kmemleak is not able to recognise those
108 * as pointers, leading to false leak reports.
110 kmemleak_ignore(pud);
115 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
117 kmem_cache_free(PGT_CACHE(PUD_CACHE_INDEX), pud);
120 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
122 *pud = __pud(__pgtable_ptr_val(pmd) | PUD_VAL_BITS);
125 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
126 unsigned long address)
129 * By now all the pud entries should be none entries. So go
130 * ahead and flush the page walk cache
132 flush_tlb_pgtable(tlb, address);
133 pgtable_free_tlb(tlb, pud, PUD_INDEX);
136 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
138 return pmd_fragment_alloc(mm, addr);
141 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
143 pmd_fragment_free((unsigned long *)pmd);
146 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
147 unsigned long address)
150 * By now all the pud entries should be none entries. So go
151 * ahead and flush the page walk cache
153 flush_tlb_pgtable(tlb, address);
154 return pgtable_free_tlb(tlb, pmd, PMD_INDEX);
157 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
160 *pmd = __pmd(__pgtable_ptr_val(pte) | PMD_VAL_BITS);
163 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
166 *pmd = __pmd(__pgtable_ptr_val(pte_page) | PMD_VAL_BITS);
169 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
170 unsigned long address)
173 * By now all the pud entries should be none entries. So go
174 * ahead and flush the page walk cache
176 flush_tlb_pgtable(tlb, address);
177 pgtable_free_tlb(tlb, table, PTE_INDEX);
180 extern atomic_long_t direct_pages_count[MMU_PAGE_COUNT];
181 static inline void update_page_count(int psize, long count)
183 if (IS_ENABLED(CONFIG_PROC_FS))
184 atomic_long_add(count, &direct_pages_count[psize]);
187 #endif /* _ASM_POWERPC_BOOK3S_64_PGALLOC_H */